Android Question BT Confusion

Terradrones · Jan 28, 2023

Hi All

I think my Brain cells are decreasing with old age and I need help as usual please.

Using the BT Library, I can see other BT devices around me. When I want to connect, it gives me an error message all the time and I cannot connect.

I have had a look at Erel's Bluetooth Chat example and I come to the conclusion that the only way that this will work is if both devices run the same program.

How do I go about connecting to an external GPS or Total Station (an instrument that measures angles and distances) using BT?

Erel · Jan 29, 2023

Don't make duplicate posts.

Terradrones said:
that the only way that this will work is if both devices run the same program.

Almost. You can only connect to Bluetooth devices that are listening for SPP connections. You also need to know the service record UUID. The default value is 00001101-0000-1000-8000-00805F9B34FB"

emexes · Jan 29, 2023

Terradrones said:
How do I go about connecting to an external GPS or Total Station (an instrument that measures angles and distances) using BT?

I was going to predict that your next question was going to be how to parse the data received from the gps station, but then your username rang a bell and I vaguely remembered you're miles ahead of me re: surveying. On the other hand, that happened after I dug this up, so... just in case:

1/ apparently a common format is SDR33, sample of it here: https://tops.iosa.it/2014/03/08/sdr33-format.html

2/ this manual has a half-reasonable description of the format: https://www.sitechwest.com/content/uploads/2016/01/TS662-UserGuide.pdf pages 175-178

Terradrones · Jan 29, 2023

Hi Emexes, my name is Michael Papenhagen and I am the developer of the mobile surveying program called "CEASER" (Civil Engineering And Surveying Earthworks Routines). This was developed in VB.net for the compact framework. This program is used by most Surveyors in Southern Africa and also elsewhere in the World.

I have the Interfacing Protocols for most of the Total Stations and GPS (Survey Grade) in VB.net and as B4A is very close to VB.net, I have already ported them over to B4A.

Maybe when you have time, you can dig up the Interfacing Protocols for the higher end Trimble Total Stations and GPS. All the Manufactures gave me their Protocols, except Trimble. The lower end Trimble Instruments are the same as Nikon.

Microsoft has stopped developing Windows Mobile any further for a couple of years now due to Android being more powerful and it is therefore logical for me to move over to Android as well.

Terradrones is the name of my Company where I use Drones for my Topographical Surveys.

If I can just get this BT to work.

agraham · Jan 29, 2023

Hi @Terradrones
I remember you from the Basic4ppc days when I was very active writing libraries for it. Wasn't your user name 'ceaser' in those days? If I remember correctly (not always true nowadays) I wrote a Delauney2D triangulation library for you. I'm glad to see you are still in business and transferring to Android.

Terradrones · Jan 29, 2023

Hi Agraham, that is true. I switched over to VB.net because with Basic4ppc the Ceaser program took too long to load. With B4A it is super fast and much faster than with Windows Mobile.

Don't I still owe you money?

agraham · Jan 29, 2023

Terradrones said:
With B4A it is super fast and much faster than with Windows Mobile.

You need to remember that the power of mobile processors has increased anually since then so it won't necessarily be due to the different OS.

Terradrones said:
Don't I still owe you money?

I can't remember

Terradrones · Jan 29, 2023

If I can just get this BT working. I am doing everything as per Erel's example, but I cannot get things to connect.

emexes · Jan 29, 2023

Terradrones said:
If I can just get this BT to work.

Can you receive any data using a generic serial terminal program? It'd be nice to know that everything outside of B4X is working first.

Terradrones · Jan 29, 2023

It works with my Windows Mobile program...I can connect, send and receive data to\from my surveying instruments.

emexes · Jan 29, 2023

Terradrones said:
It works with my Windows Mobile program...

Would probably still be good to check with the development hardware and OS actually being used.

agraham · Jan 29, 2023

For another example look at how my ESC/POS printer class connects

Bluetooth ESC/POS Printer Class

For the last couple of weeks I have been playing with an 80mm Bluetooth ESC/POS thermal printer I bought off eBay, new and delivered, for the ludicrously cheap price of £20. While the print quality, particularly of images with large areas of black (they are gray due to power supply or thermal...

www.b4x.com

Terradrones · Jan 29, 2023

agraham said:
For another example look at how my ESC/POS printer class connects

Bluetooth ESC/POS Printer Class

For the last couple of weeks I have been playing with an 80mm Bluetooth ESC/POS thermal printer I bought off eBay, new and delivered, for the ludicrously cheap price of £20. While the print quality, particularly of images with large areas of black (they are gray due to power supply or thermal...

www.b4x.com

Thank you very much Agraham, I will have a look on my PC as soon as the electricity comes on again. We sit without electricity 3 times a day for 2.5 hours each time. Sometimes its for 4 hours each each time=12 hours per day. I am sure Ukraine has more electricity than we do.

f0raster0 · Jan 30, 2023

@Terradrones try a couple things:
1. use nRF App to try to connect
(I know ?, I always say the same but it is true: it's the first step then if you can connect using nRF App the you can do it using B4X example.
1.1 make sure you have fine location ON on your Smartphone
1.2 make sure your device isn't connected somewhere else (ex.; your PC)

2. Maybe your device have to be paired in advance, example in post #12 will help you to connect from App to your device.

emexes · Jan 30, 2023

f0raster0 said:
try a couple things:
1. use nRF App to try to connect

I think the gps station is "old" Bluetooth Classic SPP Serial Port rather than "new" BLE,
but hey, might still be worth checking out in case modern gps stations have incorporated both protocols.

<JOKE> given the electricity supply issues in South Africa, perhaps BLE would be a useful option </JOKE>

Terradrones · Jan 30, 2023

emexes said:
I think the gps station is "old" Bluetooth Classic SPP Serial Port rather than "new" BLE,
but hey, might still be worth checking out in case modern gps stations have incorporated both protocols.

<JOKE> given the electricity supply issues in South Africa, perhaps BLE would be a useful option </JOKE>

??

Terradrones · Jan 31, 2023

agraham said:
For another example look at how my ESC/POS printer class connects

Bluetooth ESC/POS Printer Class

For the last couple of weeks I have been playing with an 80mm Bluetooth ESC/POS thermal printer I bought off eBay, new and delivered, for the ludicrously cheap price of £20. While the print quality, particularly of images with large areas of black (they are gray due to power supply or thermal...

www.b4x.com

Hi Agraham

I looked at the code for the Printer, but it is giving me the same error messages. I am doing something wong.

May I send you my coding to have a look at please. I am in the shit!!

I will pay you in advance via Paypal.

agraham · Jan 31, 2023

Have you paired your instrument? Does it appear in your connected devices list in settings? If so then it should be as simple as this

B4X:

' Ask the user to connect to a printer and return whether she tried or not
' If True then a subsequent Connected event will indicate success or failure
Public Sub Connect As Boolean
    Dim PairedDevices As Map
    PairedDevices = Serial1.GetPairedDevices
    Dim l As List
    l.Initialize
    For i = 0 To PairedDevices.Size - 1
        l.Add(PairedDevices.GetKeyAt(i))
    Next
    Dim Res As Int
    Res = InputList(l, "Choose a printer", -1) 'show list with paired devices
    If Res <> DialogResponse.CANCEL Then
        Serial1.Connect(PairedDevices.Get(l.Get(Res))) 'convert the name to mac address
        Return True
    End If
    Return False
End Sub

Terradrones · Feb 2, 2023

agraham said:

Have you paired your instrument? Does it appear in your connected devices list in settings? If so then it should be as simple as this

B4X:

' Ask the user to connect to a printer and return whether she tried or not
' If True then a subsequent Connected event will indicate success or failure
Public Sub Connect As Boolean
    Dim PairedDevices As Map
    PairedDevices = Serial1.GetPairedDevices
    Dim l As List
    l.Initialize
    For i = 0 To PairedDevices.Size - 1
        l.Add(PairedDevices.GetKeyAt(i))
    Next
    Dim Res As Int
    Res = InputList(l, "Choose a printer", -1) 'show list with paired devices
    If Res <> DialogResponse.CANCEL Then
        Serial1.Connect(PairedDevices.Get(l.Get(Res))) 'convert the name to mac address
        Return True
    End If
    Return False
End Sub

Hi Agraham, I paired outside my program, went back in and selected the paired unit, but still nothing happens.

May I send you my source code and if you could have a look at it. I will pay you in advance via PayPal. I am really getting desperate now.?

agraham · Feb 2, 2023

Terradrones said:
Hi Agraham, I paired outside my program, went back in and selected the paired unit, but still nothing happens.

Does this mean that your program displayed and allowed you to select the instrument? Did Connect return True. If so then I suspect you haven't set up the input and output streams. Look carefully at the EscPosPrinter class in my printer program. In particular the Serial1_Connected event.

Android Question BT Confusion

Active Member

B4X founder

Expert

Active Member

Expert

Active Member

Expert

Active Member

Expert

Active Member

Expert

Expert

Active Member

Well-Known Member

Expert

Active Member

Active Member

Expert

Active Member

Expert

Similar Threads

Privacy & Transparency

Privacy & Transparency